What is the address of Williams City Of STP?

The address on the plant’s EPA facility record is 1/2 Mile East Of Intersection Of Beech St & 2nd St, Williams, IA 50271, in Hamilton County. Its coordinates are 42.4883, -93.5295. For some plants the record holds the utility’s mailing address rather than the plant gate.

How much wastewater does Williams City Of STP treat?

Williams City Of STP is permitted for a design flow of 0.17 MGD. Its average daily flow is not available in the current EPA data.

What treatment technology does Williams City Of STP use?

Klarifi has identified one treatment structure or unit process at the Williams facility. The full treatment train, with exact unit counts, is shown in Klarifi with a free account.

What is the NPDES permit for Williams City Of STP?

The facility discharges under NPDES permit IA0058483, currently effective, expiring November 2029.

Is Williams City Of STP in compliance?

Discharge monitoring reports show no violations at Williams City Of STP in the last three years.

Who operates Williams City Of STP and how do I contact them?

Williams City Of STP is a publicly owned treatment works in Williams, Iowa. Klarifi lists decision-maker contacts for this facility, available with a free trial.

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Williams City Of STP

1/2 Mile East Of Intersection Of Beech St & 2nd St, Williams, IA 50271 · Hamilton County · Publicly Owned Treatment Works

Average flow: —

Design flow: 0.17 MGD

NPDES permit: IA0058483; Effective

Permit expires: November 2029

Population served: 307; CWNS 2022

Williams City Of STP is a publicly owned wastewater treatment works in Williams, Hamilton County, Iowa, serving about 307 residents. It discharges under NPDES permit IA0058483 (effective), which expires in November 2029, with 0 recorded violations in the last three years.

Treatment technology

One treatment structure or unit process identified at Williams City Of STP.

Available with a free Klarifi account

See the full treatment train at Williams City Of STP: structures, unit processes and planned upgrades, with exact unit counts.

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Compliance snapshot (last 3 years)

Total violations: 0

Effluent violations: 0

Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.

Key contacts

Decision-makers at Williams City Of STP.

No verified contacts on file yet

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Nearby wastewater treatment plants in Iowa

Blairsburg City Of STP

Blairsburg · 5 mi away

—

Alden WWTP

Alden · 9 mi away

0.06 MGD

Dows WWTP

Dows · 11 mi away

0.11 MGD

Kamrar City Of STP

Kamrar · 12 mi away

—

Ellsworth WWTP

Ellsworth · 13 mi away

0.14 MGD

Radcliffe City Of STP

Radcliffe · 14 mi away

—

Jewell City Of STP

Jewell · 14 mi away

0.11 MGD

Iowa Falls WWTP

Iowa Falls · 14 mi away

1.02 MGD

Williams City Of STP: frequently asked questions

Sources and methodology

Flow, permit and violation figures come from the EPA's ICIS-NPDES discharge monitoring records. Population served comes from the Clean Watersheds Needs Survey 2022. Treatment structures are identified by Klarifi's review of aerial imagery, and capital improvement projects are extracted from published municipal budget documents. Violations are counted over the last three years of monitoring reports.

Data refreshed October 26, 2026; facility record last updated March 28, 2025.

Wastewater terms: POTW · MGD · NPDES permit · Inflow and infiltration · Biological nutrient removal · Tertiary treatment · all terms

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